Pavel Smirnov questions

Pavel Smirnov answers

• Drawbacks to an idling fixed threadpool
• How does JDBC map SQL types in the java.sql.types class that don't exist in MySQL?
• Run jUnit tests per elements in a list
• How SQL would handle multiple process writes the same record into the same database table simultaneously?
• Mock Instant.now() without using Clock into Constructor or without Clock Object
• Map of generics: read and write
• What is the importance of abstract class that extends from another abstract class
• What is the difference between Java intrinsic and native methods?
• ANTLR 4 - Mismatched input
• jdk 8 run empty main function , why PSYoungGen already used about 1000k space